Update docs

Author: ilyaspiridonov

SUMMARY.md

@@ -13,3 +13,4 @@
 * [I have Translated a Document. When Will My Translation Go Live on GitHub?](translations_on_github.md)
 * [Where Can I See Project Statistics?](project_statistics.md)
 * [Can I Use a Project Glossary?](glossaries.md)
+* [Can I Specify Custom Language Codes for the Project Languages?](custom_language_codes.md)

custom_language_codes.md

@@ -1,4 +1,4 @@
-## Can I Specify Custom Language Codes for the Project Languages?
+# Can I Specify Custom Language Codes for the Project Languages?
 
 Custom language codes can be specified for each project language when creating a project or later in the Manage Languages section (available to Admins and Owner). Language codes will replace the `%lang%` placeholder in the output paths (which affects the locations where translation files will be created).
 ![Project Paths](/assets/img/project_paths/project_paths.gif)

project_paths.md

@@ -80,5 +80,5 @@ This configuration will sync source files from the `guides-and-tutorials` direct
 
 ## Configuring Custom Language Codes
 
-Custom language codes can be specified for each project language when creating a project or later in the Manage Languages section. Language codes will replace the `%lang%` placeholder in the output paths (locations where translation files will be created).
+Custom language codes can be specified for each project language when creating a project or later in the Manage Languages section (available to Admins and Owner). Language codes will replace the `%lang%` placeholder in the output paths (locations where translation files will be created).
 ![Project Paths](/assets/img/project_paths/project_paths.gif)